igneous
Pumice
Felsic volcanic rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, pale grey to white color, dull luster, amorphous glassy structure, highly porous and floats on water.
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Physical properties
Hardness of 6 on the Mohs scale, pale grey to white color, dull luster, amorphous glassy structure, highly porous and floats on water.
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, dating from recent to ancient geological eras.
Uses & applications
Used in abrasive cleaners, lightweight concrete aggregate, personal care exfoliating stones, and horticulture soil amendments.
Geological facts
Pumice can float on water for long periods due to trapped gas bubbles inside its interlocking glass matrix. It forms the classic frothy texture seen in explosive eruptions like Krakatoa.
Field identification & locations
Easily identified by its extreme lightness, vesicular texture, and ability to float. Found globally near active or historic volcanic regions.
